I was surprised to see this description of ‘polished’ in one of the first books on Home Brewing to be published after the practice became legal, written by the Editor of Home Winemaker, C.J.J. Berry. A quick check on the web turned up this Ingested asbestos in filtered beer, in addition to occupational exposure, as a causative factor in oesophageal adenocarcinoma - British Journal of Cancer which led me to wonder when asbestos first began to get a bad name.
Back in 1964, in partnership with a friend, I started moulding fibreglass boats and other items. One of our suppliers of glass reinforcements was Turner Bros, (Asbestos) of Rochdale. At some stage they changed their name to just TBA, then removed any suggestion of asbestos by becoming Turner and Newall.
Asbestos cement corrugated sheeting was the material of choice when I put the roof on what became my brewery in 1979, and asbestos rope and string was in common usage for lagging. I drank a lot of draught beer in the 60’s and 70’s, but at least until now have had no ill effects. A bit frightening though isn’t it.